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//To calculate the relative population
c = 3*10^8; //speed of light, m/sec
h = 6.6*10^-34; //planck's constant
e = 1.6*10^-19;
T = 300; //temperature, K
K = 8.61*10^-5;
lamda = 6943; //wavelength, armstrong
lamda = lamda*10^-10; //wavelength, m
// let E2 - E1 be E
E = h*c/lamda; //energy, J
E = E/e; //energy, eV
//let population ratio N2/N1 be N
N = exp(-E/(K*T));
printf("relative population of 2 states is");
disp(N);
//answer given in the book is wrong
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